TreadPlus Learn
Wheel Alignment Technical Library
Alignment fundamentals, geometry, measurement, adjustment and diagnosis.
Technical collection
Practical technical references.
Review definitions, measurement principles, workshop procedures, diagnostic references, tables, diagrams and frequently asked questions prepared for professional equipment users.
Wheel Alignment Adjustment Sequence
A rear-to-front alignment sequence explaining why ride height, rear camber, rear toe, front caster/camber and front toe are handled in a controlled order.
4 min readProcedures & DiagnosisHow to Read a Wheel Alignment Report
A practical guide to before and after values, units, color ranges, total and cross values, thrust angle and customer-facing report explanation.
4 min readFundamentalsUnderstanding Wheel Alignment Specifications
How to read preferred values, minimum and maximum tolerances, cross values and vehicle-condition requirements in an alignment specification database.
5 min readAngles & GeometryCamber Angle Explained
Positive and negative camber, cross camber, tire wear, ride-height influence, diagnostic interpretation and adjustment practice.
4 min readProcedures & DiagnosisHow a Caster Sweep Works
The measurement geometry, sweep angles, turn-plate preparation, common errors and repeatability checks used to calculate caster and SAI.
4 min readAngles & GeometryCaster Angle Explained
Positive caster, cross caster, steering returnability, road crown, measurement by caster sweep and adjustment considerations.
4 min readAngles & GeometryIncluded Angle Explained
The relationship between Steering Axis Inclination and camber, and how included angle supports collision and suspension diagnosis.
3 min readAngles & GeometryIndividual Toe and Steering-Wheel Position
How left and right individual toe relate to the thrust line, steering gear center and steering-wheel position.
4 min readFundamentalsWheel Alignment: A Practical Introduction
A technician-focused introduction to wheel alignment, vehicle reference lines, measurement workflow and the difference between measuring and correcting geometry.
6 min readFundamentalsPre-Alignment Inspection Checklist
A complete pre-alignment inspection covering tires, wheels, steering, suspension, ride height, loading and alignment-bay preparation.
5 min readAngles & GeometryRide Height and Wheel Alignment
Why ride height changes alignment geometry, how to measure it correctly and when height must be corrected before alignment.
4 min readProcedures & DiagnosisRunout Compensation in Wheel Alignment
Why wheel, rim and clamp runout must be compensated, how rolling and raised methods work, and how to protect compensation accuracy.
4 min readAngles & GeometrySteering Axis Inclination (SAI)
How Steering Axis Inclination is calculated, its relationship to camber and included angle, and how it helps identify bent or displaced components.
4 min readAngles & GeometryScrub Radius and Steering Geometry
What scrub radius is, how wheel offset and Steering Axis Inclination affect it, and why changes influence steering, braking and road feel.
4 min readAngles & GeometrySetback Explained
Front and rear setback, wheelbase difference, diagnostic links to caster and collision damage, and measurement interpretation.
4 min readProcedures & DiagnosisSteering Wheel Centering During Alignment
How to center the steering gear and steering wheel, balance individual toe around the thrust line and verify the result on the road.
4 min readAngles & GeometryThrust Angle Explained
How rear individual toe establishes the thrust line, why it affects steering-wheel position and how to adjust the vehicle from rear to front.
4 min readAngles & GeometryToe-Out on Turns and Ackermann Geometry
How inner and outer steering angles differ in a turn, how an aligner checks toe-out on turns and what abnormal readings may indicate.
4 min readAngles & GeometryToe Angle Explained
A detailed explanation of toe-in, toe-out, tire scrub, steering-wheel position, measurement references and professional toe adjustment.
5 min readAngles & GeometryTotal Toe: Reading the Axle as a System
What total toe means, how it differs from individual toe, how toe is calculated and why an acceptable total can still hide an off-center steering condition.
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